#ifndef system_h
  #define system_h
	 //IO 口地址映射
	#define GPIOA_IDR_Addr (GPIOA_BASE+8) //0x40010808
	#define GPIOB_IDR_Addr (GPIOB_BASE+8) //0x40010C08
	#define GPIOC_IDR_Addr (GPIOC_BASE+8) //0x40011008
	#define GPIOD_IDR_Addr (GPIOD_BASE+8) //0x40011408
	#define GPIOE_IDR_Addr (GPIOE_BASE+8) //0x40011808
	#define GPIOF_IDR_Addr (GPIOF_BASE+8) //0x40011A08
	#define GPIOG_IDR_Addr (GPIOG_BASE+8) //0x40011E08
	#define GPIOA_ODR_Addr (GPIOA_BASE+12) //0x4001080C
	#define GPIOB_ODR_Addr (GPIOB_BASE+12) //0x40010C0C
	#define GPIOC_ODR_Addr (GPIOC_BASE+12) //0x4001100C
	#define GPIOD_ODR_Addr (GPIOD_BASE+12) //0x4001140C
	#define GPIOE_ODR_Addr (GPIOE_BASE+12) //0x4001180C
	#define GPIOF_ODR_Addr (GPIOF_BASE+12) //0x40011A0C
	#define GPIOG_ODR_Addr (GPIOG_BASE+12) //0x40011E0C
	
	#define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr&0xFFFFF)<<5)+(bitnum<<2))
	//把 addr 地址强制转换为 unsigned long 类型的指针
	#define MEM_ADDR(addr) *((volatile unsigned long *)(addr))
	//把位带别名区内地址转换为指针 ，获取地址内的数据
	#define BIT_ADDR(addr, bitnum) MEM_ADDR(BITBAND(addr, bitnum))
	//IO 口操作,只对单一的 IO 口!
	//确保 n 的值小于 16!
	#define PAin(n) 	BIT_ADDR(GPIOA_IDR_Addr,n) //输入
	#define PBin(n) 	BIT_ADDR(GPIOB_IDR_Addr,n) //输入
	#define PCin(n) 	BIT_ADDR(GPIOC_IDR_Addr,n) //输入
	#define PDin(n) 	BIT_ADDR(GPIOD_IDR_Addr,n) //输入
	#define PEin(n) 	BIT_ADDR(GPIOE_IDR_Addr,n) //输入
	#define PFin(n) 	BIT_ADDR(GPIOF_IDR_Addr,n) //输入
	#define PGin(n) 	BIT_ADDR(GPIOG_IDR_Addr,n) //输入
	#define PAout(n) 	BIT_ADDR(GPIOA_ODR_Addr,n) //输出
	#define PBout(n) 	BIT_ADDR(GPIOB_ODR_Addr,n) //输出
	#define PCout(n) 	BIT_ADDR(GPIOC_ODR_Addr,n) //输出
	#define PDout(n) 	BIT_ADDR(GPIOD_ODR_Addr,n) //输出
	#define PEout(n) 	BIT_ADDR(GPIOE_ODR_Addr,n) //输出
	#define PFout(n) 	BIT_ADDR(GPIOF_ODR_Addr,n) //输出
	#define PGout(n) 	BIT_ADDR(GPIOG_ODR_Addr,n) //输出
#endif